This patchset adds on the previous one, merging the suggestionsmade mainly by Gleb, Peter and Marcelo.

SCHEDSTATS is now used when available to provide information abouttime spent on the runqueue for the cpu threads. Information to/fromthe guest is obtained using *_cached() functions, as suggested by Gleb.

On the guest side, the two "prev_steal_time" variables are colapsedinto a single one. Steal time accounting is also done insideupdate_rq_clock().